Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e05d92de885416a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 11:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d43a577bd7d0db798130c1378df10878 SHA-1: af06e9fbfaf427a7e8ed7495807ff87adea83cf3 SHA-256: 8e05d92de885416a629f049972ee6ad6d79d804d6570068ec8e4ab65aa4b9afe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cncostruzioni.com/userfiles/file/doseguwefupuwen.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459b3013afe---kopemupa.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/25712921946.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/giguxeb.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/sudiwil.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/fodesatozabumowakofod.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_FA70742D322DC358.pdfIn PDF document text
    • https://schmitz.cz/res/file/dirijeputofonowutitokiz.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/mogafelokozatom.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4f1276eb47554fb36e314eb2a90defa9/78915753272.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/savoxunutisiguka.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/duturomolovudoniniruju.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/gifuzuwirosudixigomas.pdfIn PDF document text
    • https://fishboat.hr/files/69918313178.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/9124560278.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/50750461601.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92238783454.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/wejativuk.pdfIn PDF document text
    • https://ms01bet.com/contents/files/14670380895.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/10785109680.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/vakoferelimofaminez.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/jukobakatalekegixi.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91347574777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=farming+simulator+18+hack+version+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 14756 bytes
SHA-256: c1ab3e7fcebd7643af289d80f86303f4889865834e3871c30ac192ae6e7dc475
font_01_sfnt_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 11396 bytes
SHA-256: 7140dc17f8343ae0bfba793f93de61b71ea7c117b65f80e341741abfbe6e99f6
font_02_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1